“The AWS SDK for .NET makes it even easier for Windows developers to build .NET applications that tap into the cost-effective, scalable, and reliable AWS cloud. Using the SDK, developers will be able to build solutions for AWS infrastructure services, including Amazon Simple Storage Service (Amazon S3), Amazon Elastic Compute Cloud (Amazon EC2), and Amazon SimpleDB. With the AWS SDK for .NET, developers get started in minutes with a single, downloadable package complete with Visual Studio project templates, the AWS .NET library, C# code samples, and documentation.

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A nice touch is that besides the DLL, docs (in Help 2 form) and some samples, they have also released the source to the library too (so you can see the magic behind the curtain, etc).